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Old 07-03-2019, 01:56 PM   #9
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,277
The reason Porsche added the line from the top of the cooler to the surge tank in the trunk is that the oil cooler is the highest point in the cooling system, and tended to collect any air bubbles in the system, reducing the cooler's efficiency. Adding the line prevented that from happening.
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